Results
Section 1 General information of the sample group
Of 49 workers, 40 were female (81.6%) and 9 were
male (18.4%). Subjects were in the range of 22–72 yr of
age, and the average age was 50.2 yr. A majority of subjects
were aged between 41–50 yr of age (30.6%). Their
length of work experience ranged from 1–55 yr and 28.1
yr on average. The daily working hours were between
2–12 h and 6.7 h on average. The number of working
days per week were at 3–7 d and 5.3 d on average. Most
subjects worked 5 d a week. The number of sleeping
hours were from 4–9 h and 5.9 h on average. Most subjects
slept around 5–6 h. As for the survey on daily
income during January–April 2007, it was found that their
daily income was about 80–1,500 baht and 379.2 baht on
average. A majority of subjects earned 201–500 baht per
day. Meanwhile, for the income survey during
June–September 2007, it was shown that their daily
income was 100–2,000 baht and 529.7 baht on average.
Most of the subjects earned 201–500 baht per day. The
aforementioned general information data is tabulated in
Table 1.